7789-02-8

Basic information

• Product Name: CHROMIUM(III) NITRATE NONAHYDRATE
• Synonyms: ChroMiuM(III) nitrate nonahydrate, 99% 500GR;ChroMiuM nitrate nonahydrate, 99.99%, (trace Metal basis);CHROMIUM(III) NITRATE NONAHYDRATE FOR AN;ChroMiuM(III) nitrate nonahydrate >=99.99% trace Metals basis;Chromium nitate;Chromium(III) nitrate nonahydrate, 98.5% trace metals basis;Chromium(III) Nitrate Nonahydrate98.0-101.0%;Chromium isotopic standard
• CAS NO: 7789-02-8
• Molecular Formula: CrH18N3O18
• Molecular Weight: 400.14832
• EINECS: 236-921-1
• Product Categories: Chromium Salts;Metal and Ceramic Science;Salts;Catalysis and Inorganic Chemistry;Chemical Synthesis;Chromium;Analytical Reagents for General Use;C-D, Puriss p.a.;Puriss p.a.;metal nitrate salts
• Mol File: 7789-02-8.mol
• Article Data: 0

Chemical Properties

• Melting Point: 60 °C(lit.)
• Boiling Point: 100°C
• Appearance: Violet to black/Solid
• Density: 1.80 g/mL(lit.)
• Vapor Pressure: 49.8mmHg at 25°C
• Storage Temp.: Store at +15°C to +25°C.
• Solubility: H2O: very soluble(lit.)
• Water Solubility: Soluble in water and alcohol.
• Stability: Stable at room temperature, but may explode if heated. Incompatible with organic materials, reducing agents. Use polyethylene to
• Merck: 14,2226
• CAS DataBase Reference: CHROMIUM(III) NITRATE NONAHYDRATE(CAS DataBase Reference)
• NIST Chemistry Reference: CHROMIUM(III) NITRATE NONAHYDRATE(7789-02-8)
• EPA Substance Registry System: CHROMIUM(III) NITRATE NONAHYDRATE(7789-02-8)

Safety Data

• Hazard Codes: O,Xi
• Statements: 8-36/38
• Safety Statements: 17-26-36
• RIDADR: UN 2720 5.1/PG 3
• WGK Germany: 2
• RTECS: GB6300000
• F: 9
• TSCA: Yes
• HazardClass: 5.1
• PackingGroup: III
• Hazardous Substances Data: 7789-02-8(Hazardous Substances Data)

Usage

Chemical Properties

deep blue or violet crystals

Uses

Chromium nitrate is used in the manufacture of alkali metal-free catalysts and in preservation. It is used in the preparation of chrome catalysts, in textile printing operations, and as a corrosion inhibitor. Chromium(III) nitrate as a source of chromium is added to food supplements for nutritional purposes .

Purification Methods

The pure deep violet nonahydrate salt is best prepared freshly from pure recrystallised (3 times) chromium (VI) trioxide and pure nitric acid. A solution is prepared by dissolving 1g of CrO3 in 3mL of H2O and 2mL of pure HNO3, and carefully, with stirring (behind a screen) pure MeOH (0.5-1.0mL) is added dropwise carefully (shield) with cooling to avoid a violent reaction. A bluish colour develops as Cr(VI) is reduced to Cr(III). When this solution is diluted to 130,000ppm of the salt, analysis detected by ICP/MS gave the following trace elements (ppm in brackets): Sr (33), Na (3.5), Mo, Ni, Cu, Si and Mg (0.13 each), Se, Zn, Al (0.026 each), Ti (1.5), Fe (4.9), Co (0.07), Sn (0.065), Ba (0.013 and W (0.078). Evaporation of the methanolic solution in high vacuum over CaCl2 eventually yields pure deep violet rhombic crystals of chromium (III) nitrate nonahydrate. An aqueous solution of this salt becomes green on heating but reverts to the violet colour on cooling.

InChI:InChI=1/Cr.3NO3.9H2O/c;3*2-1(3)4;;;;;;;;;/h;;;;9*1H2/q+3;3*-1;;;;;;;;;